下表列出了 IPFIX 資訊元素定義。
| 384 | valueDistributionMethod | 用來散發計數器的方法說明，該計數器從提供流量至彙總流量的記錄如相關聯範圍 (通常是範本) 所描述。系統會將該方法視為套用至參考範圍內的所有非金鑰資訊元素，值散發對其為有效的操作。如果 originalFlowsInitiated 和/或 originalFlowsCompleted 資訊元素顯示在範本中，則其不會受此散發方法的約束，因為它們會各自推斷其自己的散發方式。這是一組完整的可能值散發方法；其編碼方式如下： +-------+-----------------------------------------------------------+ | Value | Description | +-------+-----------------------------------------------------------+ | 0 | Unspecified: The counters for an Original Flow are | | | explicitly not distributed according to any other method | | | defined for this Information Element; use for arbitrary | | | distribution, or distribution algorithms not described by | | | any other codepoint. | | | --------------------------------------------------------- | | | | | 1 | Start Interval: The counters for an Original Flow are | | | added to the counters of the appropriate Aggregated Flow | | | containing the start time of the Original Flow. This | | | must be assumed the default if value distribution | | | information is not available at a Collecting Process for | | | an Aggregated Flow. | | | --------------------------------------------------------- | | | | | 2 | End Interval: The counters for an Original Flow are added | | | to the counters of the appropriate Aggregated Flow | | | containing the end time of the Original Flow. | | | --------------------------------------------------------- | | | | | 3 | Mid Interval: The counters for an Original Flow are added | | | to the counters of a single appropriate Aggregated Flow | | | containing some timestamp between start and end time of | | | the Original Flow. | | | --------------------------------------------------------- | | | | | 4 | Simple Uniform Distribution: Each counter for an Original | | | Flow is divided by the number of time intervals the | | | Original Flow covers (that is, of appropriate Aggregated | | | Flows sharing the same Flow Key), and this number is | | | added to each corresponding counter in each Aggregated | | | Flow. | | | --------------------------------------------------------- | | | | | 5 | Proportional Uniform Distribution: Each counter for an | | | Original Flow is divided by the number of time units the | | | Original Flow covers, to derive a mean count rate. This | | | mean count rate is then multiplied by the number of times | | | units in the intersection of the duration of the Original | | | Flow and the time interval of each Aggregated Flow. This | | | is like simple uniform distribution, but accounts for the | | | fractional portions of a time interval covered by an | | | Original Flow in the first- and last-time interval. | | | --------------------------------------------------------- | | | | | 6 | Simulated Process: Each counter of the Original Flow is | | | distributed among the intervals of the Aggregated Flows | | | according to some function the Intermediate Aggregation | | | Process uses based upon properties of Flows presumed to | | | be like the Original Flow. This is essentially an | | | assertion that the Intermediate Aggregation Process has | | | no direct packet timing information but is nevertheless | | | not using one of the other simpler distribution methods. | | | The Intermediate Aggregation Process specifically makes | | | no assertion as to the correctness of the simulation. | | | --------------------------------------------------------- | | | | | 7 | Direct: The Intermediate Aggregation Process has access | | | to the original packet timings from the packets making up | | | the Original Flow, and uses these to distribute or | | | recalculate the counters. | +-------+-----------------------------------------------------------+ |
| 239 | biflowDirection | 用於指派 Biflow 來源和目的地的方向指派方法說明。此資訊元素可能存在於流量資料記錄中，或是套用至使用 IPFIX 選項從匯出程序或觀察網域匯出的所有流量。如果此資訊元素不存在流量記錄中或透過範圍與 Biflow 相關聯，則系統會假定方向指派方法的組態是在頻外完成。
備註： 使用 IPFIX 選項將此資訊元素套用至觀察網域內或來自匯出程序的所有流量時，必須可靠地傳送選項。如果可靠傳輸無法使用 (也就是使用 UDP 時)，則此資訊元素必須顯示在每個流量記錄中。
此欄位可能會採用下列值： +-------+------------------+----------------------------------------+ | Value | Name | Description | +-------+------------------+----------------------------------------+ | 0x00 | arbitrary | Direction is assigned arbitrarily. | | 0x01 | initiator | The Biflow Source is the flow | | | | initiator, as determined by the | | | | Metering Process' best effort to | | | | detect the initiator. | | 0x02 | reverseInitiator | The Biflow Destination is the flow | | | | initiator, as determined by the | | | | Metering Process' best effort to | | | | detect the initiator. This value is | | | | provided for the convenience of | | | | Exporting Processes to revise an | | | | initiator estimate without re-encoding | | | | the Biflow Record. | | 0x03 | perimeter | The Biflow Source is the endpoint | | | | outside of a defined perimeter. The | | | | perimeter's definition is implicit in | | | | the set of Biflow Source and Biflow | | | | Destination addresses exported in the | | | | Biflow Records. | +-------+------------------+----------------------------------------+ |
